across america, these technologies protect air - by monitoring air quality and reducing emissions... ...protect water - through conservation and self-contained recycling systems... ... and protect land - by reducing our footprint and respecting wildlife. america's natural gas... domestic, abundant, clean energy to power our lives... that's smarter power today. >>> welcome back. raw politics now. tuesday's town hall debate could provide another boost to mitt romney's momentum or stop it cold. whichever body language will almost certainly play a part. it has throughout debate history. it did in this year's first presidential debate. it certainly did last night. in fact, it was as plain as the smile on joe biden face or the water glass in paul ryan's hand. gary tuchman watched the debate with social scientist amy cuddy, not looking to pick a winner, just aiming to spot a tell. >> first talk about the handshake. this is important to you, right? what do we see here? >> ryan is going in with his hand up a little farther, it's open and raised. >> what does that tell you that his hand is rai